What is the entropy change for the third reaction below?

N2 (g) + O2 (g) → 2NO (g), ∆H = 180 kJ

2NO2 (g) → 2NO (g) + O2 (g), ∆H = 112 kJ

N2 (g) + 2O2 (g) → 2NO2 (g)

A) 34 kJ

B) 292 kJ

C) 146 kJ

D) 68 kJ

Which statement best describes evolution? A. Species have changed over time B. Traits acquired during a lifetime are Passed to offspring C. Earths organisms have not changed overtime D. All of earths organisms were formed at the same time

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.

The volume of a gas is 4.0 L when the pressure is 1.00 atm. At the same temperature, what is the pressure at which the volume of the gas is 2.0 L?

What is the smallest unit of an elemwntthat still has properties of that elemwnt

How many moles of H2SO4 are present in 0.500 L of a 0.150 M H2SO4 solution?

7) change 21.1 mg into grams

Why is an ionic solution a good conductor of electricity while a covalent solution is a poor conductor

How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem. Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)

The notation for the nuclide 13755Cs gives information about (1) mass number, only (2) atomic number. only (3) both mass number and atomic number (4) neither mass number nor atomic number

Which is an example of pure chemistry